What is the CVSS score of CVE-2021-23017?

CVE-2021-23017 has a CVSS 3.1 base score of 7.7 (High). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L. EPSS exploitation probability: 53.5%.

Is there a public PoC exploit available for CVE-2021-23017?

Yes, a public proof-of-concept exploit is available for CVE-2021-23017. Prioritise patching immediately. EPSS: 53.5%.

Is there a patch available for CVE-2021-23017?

Yes, a patch is available for CVE-2021-23017. Update the affected software to the latest version immediately.

Openresty CVE-2021-23017

HIGH

Off-by-one Error (CWE-193)

2021-06-01 f5sirt@f5.com

Nginx Denial Of Service Openresty Fedora Ontap Select Deploy Administration Utility Blockchain Platform Communications Control Plane Monitor Communications Fraud Monitor Communications Operations Monitor Communications Session Border Controller Enterprise Communications Broker Enterprise Session Border Controller Enterprise Telephony Fraud Monitor Goldengate

7.7

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.7 HIGH

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

Low

Lifecycle Timeline

CVE Published

Jun 01, 2021 - 13:15 nvd

HIGH 7.7

DescriptionNVD

AnalysisAI

A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process. Rated high severity (CVSS 7.7), this vulnerability is remotely exploitable, no authentication required. Public exploit code available.

Technical ContextAI

This vulnerability is classified under CWE-193. A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or potential other impact. Affected products include: F5 Nginx, Openresty, Fedoraproject Fedora, Netapp Ontap Select Deploy Administration Utility, Oracle Blockchain Platform.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.